Microwave ablation assembly

Abstract

The utility model discloses a microwave ablation assembly which comprises an outer sleeve which is hollow and provided with ports at the front end and the rear end; the rear end of the sheathing canal is detachably connected to the rear end of the outer cannula, the sheathing canal is coaxially communicated with the outer cannula, and a negative pressure suction side tube is arranged on the side wall of the sheathing canal; and the ablation needle locking mechanism has a locking state for locking the position of the ablation needle inserted into the outer sleeve and an unlocking state for loosening the ablation needle inserted into the outer sleeve. The ablation needle can be inserted into the outer sleeve, and after the ablation needle reaches an ablation position, the ablation needle locking mechanism can be switched to a locking state, so that the ablation needle inserted into the outer sleeve is subjected to position locking, people do not need to hold the ablation needle all the time, the energy and physical output of operators is reduced, the ablation needle is mechanically locked more stably, and the ablation needle locking efficiency is improved. When the ablation needle needs to be taken down or moved, the ablation needle locking mechanism can be switched to the unlocking state, the ablation needle can move freely, and operation is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a microwave ablation component. Background Art

[0002] Microwave ablation therapy for tumors offers advantages such as minimally invasive surgery, ease of use, high thermal efficiency, and good patient tolerance. It has become an important treatment for tumors. It is equivalent to surgical resection for tumors within 3 cm without metastasis, playing a more significant role in controlling tumor progression, prolonging patient survival, and improving quality of life. Microwave tumor ablation utilizes the thermal effect of microwave energy on tissue, causing it to coagulate and inactivate at an instantaneous high temperature, achieving the goal of tumor ablation.

[0003] However, when traditional microwave ablation devices are used for microwave ablation treatment, the inactivated tumor tissue rarely undergoes absorption and cavitation in the body, and most of it becomes fibrous proliferation foci, which takes a long time to evolve. This leads to slow recovery for patients, heavy psychological burden on patients, difficulty in judging the activity of residual tumor in the local lesion, and potential risk of residual tumor due to insufficient ablation, and even the need for a second operation. Moreover, the ablation needle relies entirely on the hand support of medical staff during the ablation process. Long-term hand support consumes a lot of energy and physical strength of the doctor, and it is not stable. During conventional ablation, larger tumors require multiple punctures, with many ablation needles and needle tracts, and additional punctures and drainage are required when hydropneumothorax occurs. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a microwave ablation assembly that can fix the ablation needle during the ablation process, eliminating the need for the doctor to constantly hold the ablation needle.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A microwave ablation assembly comprises: an outer sleeve, which is hollow and has ports at both ends, and is used for inserting one of a puncture needle core, an ablation needle and a rotary cutter; a sheath, whose rear end is detachably connected to the rear end of the outer sleeve, and the sheath is coaxially connected to the outer sleeve, and the side wall of the sheath is provided with a negative pressure suction side tube, and the negative pressure suction side tube is used to connect to a negative pressure suction device; an ablation needle locking mechanism, which has a locking state for locking the position of the ablation needle inserted into the outer sleeve and an unlocking state for releasing the ablation needle inserted into the outer sleeve, and the ablation needle locking mechanism is movably installed on the outer sleeve to realize switching between the locked state and the unlocked state.

[0007] Furthermore, the outer peripheral wall at the rear end of the outer sleeve is provided with a first external threaded surface, and the outer peripheral wall of the outer sleeve is provided with a movable hole. The ablation needle locking mechanism includes a spiral locking sleeve and a tightening column. The spiral locking sleeve is threadedly connected to the first external threaded surface, and the tightening column is movably passed through the movable hole. The spiral locking sleeve can be rotated to adjust the position. When the spiral locking sleeve moves downward, it can drive the tightening column to move inward to tighten the ablation needle inserted into the outer sleeve, so as to lock the position of the ablation needle.

[0008] Furthermore, the inner circumferential wall of the bottom of the spiral locking sleeve is provided with a conical surface and a cylindrical surface in sequence from top to bottom, the conical surface is flared downward, and the cylindrical surface is connected to the bottom of the conical surface. The downward movement of the conical surface can push the tightening column to move inward; when the outer end of the tightening column contacts the cylindrical surface, the tightening column at least partially stays in the movable hole.

[0009] Furthermore, a main pipe portion having an outer diameter greater than the diameter of the first external threaded surface is provided in the middle portion of the sheath tube, and the front end face of the main pipe portion is fitted with the rear end face of the outer sleeve to limit the rearward movable stroke of the spiral locking sleeve, and when the rear end of the spiral locking sleeve abuts against the front end of the main pipe portion, the outer end of the tightening column corresponds to the cylindrical surface.

[0010] Furthermore, the ablation needle locking mechanism also includes a locking pad, the outer end of the tightening column is a hemispherical surface, the inner end surface is provided with an embedding groove, the locking pad is attached to the inner end surface of the tightening column, and the locking pad is provided with an embedding column embedded in the embedding groove.

[0011] Furthermore, a limiting ring is provided on the peripheral wall of the tightening column. The limiting ring is provided outside the outer sleeve, and the outer peripheral contour of the limiting ring is larger than the movable hole to limit the depth of the tightening column inserted into the outer sleeve.

[0012] Furthermore, the locking pad is made of silicone material, and the embedded column and the embedded groove are interference fit.

[0013] Furthermore, the rear end of the outer sleeve is provided with a convex shaft section, the first external threaded surface is provided on the outer circumferential wall of the convex shaft section, the inner circumferential wall of the convex shaft section is provided with an internal threaded hole, the bottom of the sheath is provided with an external threaded shaft, and the external threaded shaft is threadedly connected to the internal threaded hole of the convex shaft section.

[0014] Furthermore, a plurality of through holes are arranged around the outer peripheral wall of the front end of the outer sleeve.

[0015] Furthermore, a sealing plug is connected to the peripheral wall of the sheath tube, and the sealing plug can be inserted into the rear end of the sheath tube to seal the rear end of the sheath tube.

[0016] The utility model has the following beneficial effects:

[0017] The outer sleeve can be used for inserting the ablation needle. When the ablation needle reaches the ablation position, the ablation needle locking mechanism can be switched to the locked state, thereby locking the position of the ablation needle inserted into the outer sleeve. There is no need for people to hold the ablation needle all the time, which reduces the energy and physical exertion of the operator, and the mechanically locked ablation needle is more stable. When the ablation needle needs to be removed or moved, the ablation needle locking mechanism can be switched to the unlocked state, and the ablation needle can move freely without affecting the operation. In addition, when hydropneumothorax occurs, no additional puncture and drainage is required, and negative pressure suction can be performed using the negative pressure suction side tube. The ablation tissue can be removed by inserting a rotary cutter, and the removed tissue can be extracted using the negative pressure suction side tube.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the decomposed state structure;

[0022] Figure 3 It is a partial cross-sectional view of an embodiment of the utility model;

[0023] Figure 4 This is a schematic structural diagram of the jacking column and locking washer in an exploded state according to one embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a tightening column and a locking washer in an exploded state according to another embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of another structural form of the ablation needle locking mechanism of the utility model.

[0026] Legend:

[0027] Outer sleeve 100, first external threaded surface 110, movable hole 120, protruding shaft section 130, through hole 140;

[0028] Sheath tube 200, negative pressure suction side tube 210, main tube 220, external threaded shaft 230;

[0029] Ablation needle locking mechanism 300, spiral locking sleeve 310, conical surface 311, cylindrical surface 312, tightening post 320, embedding groove 321, limiting ring 322, locking washer 330, embedding post 331;

[0030] Sealing plug 400 and connecting line 410. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0035] Please refer to Figure 1 and Figure 2 A microwave ablation assembly in a preferred embodiment of the present invention includes an outer sleeve 100 , a sheath 200 and an ablation needle locking mechanism 300 .

[0036] The outer cannula 100 is hollow and has ports at both ends. The outer cannula is used to insert one of the puncture needle core, ablation needle, and rotary cutter, and different operations can be achieved by inserting different accessories. The rear end of the sheath tube 200 is detachably connected to the rear end of the outer cannula 100. The sheath tube 200 is coaxially connected to the outer cannula 100. The side wall of the sheath tube 200 is provided with a negative pressure suction side tube 210 for connecting to a negative pressure suction device, which can be a negative pressure suction pump.

[0037] The ablation needle locking mechanism 300 has a locking state for locking the position of the ablation needle inserted into the outer sleeve 100 and an unlocking state for releasing the ablation needle inserted into the outer sleeve 100. The ablation needle locking mechanism 300 is movably mounted on the outer sleeve 100 to switch between the locking state and the unlocking state.

[0038] The present invention provides a microwave ablation component, wherein an outer sleeve 100 is provided for inserting an ablation needle. When the ablation needle reaches the ablation position, the ablation needle locking mechanism 300 can be switched to a locked state, thereby locking the position of the ablation needle inserted into the outer sleeve 100. There is no need for a person to hold the ablation needle all the time, which reduces the energy and physical exertion of the operator, and the mechanically locked ablation needle is more stable. When the ablation needle needs to be removed or moved, the ablation needle locking mechanism 300 can be switched to an unlocked state, and the ablation needle can move freely without affecting the operation. In addition, when hydropneumothorax occurs, no additional puncture and drainage is required, and negative pressure suction can be performed using the negative pressure suction side tube 210.

[0039] Reference Figure 2In some embodiments of the present invention, a first externally threaded surface 110 is provided on the outer peripheral wall of the rear end of the outer sleeve 100, and a movable hole 120 is provided on the peripheral wall of the outer sleeve 100. The movable hole 120 is preferably provided at a position of the outer sleeve 100 adjacent to the first externally threaded surface 110. The ablation needle locking mechanism 300 includes a spiral locking sleeve 310 and a tightening post 320. The spiral locking sleeve 310 is threadedly connected to the first externally threaded surface 110, and the tightening post 320 is movably provided in the movable hole 120. It is understood that the tightening post 320 and the movable hole 120 are adapted in diameter to achieve a certain sealing effect. Of course, in order to enhance the sealing effect, a sealing ring can also be provided at the position where the tightening post 320 contacts the movable hole 120. Because of the threaded connection, the spiral locking sleeve 310 can be rotated to adjust its position. When the spiral locking sleeve 310 moves downward, it can drive the tightening post 320 to move inward to tighten the ablation needle inserted into the outer sleeve 100, thereby locking the ablation needle in place. When it is necessary to switch to the unlocked state, the spiral locking sleeve 310 only needs to be rotated and moved upward so that the spiral locking sleeve 310 no longer presses against the tightening post 320 inward. It can be understood that the tightening post 320 facing inward means that the tightening post 320 is toward the center of the outer sleeve 100. Thus, the ablation needle can be locked or unlocked by twisting the spiral locking sleeve 310, which is simple and convenient to operate. In addition, for easier operation, the spiral locking sleeve 310 is also provided with a multi-prism surface on its peripheral wall to facilitate the twisting operation.

[0040] Reference Figure 3 In a further embodiment of the present invention, the inner circumferential wall of the bottom of the spiral locking sleeve 310 is provided with a conical surface 311 and a cylindrical surface 312 in sequence from top to bottom. Of course, the center of the spiral locking sleeve 310 is provided with an internal threaded hole adapted to the first external threaded surface 110 at the upper end of the conical surface 311. The conical surface 311 is flared downward, and the cylindrical surface 312 is connected to the bottom of the conical surface 311. The downward movement of the conical surface 311 can push the tightening post 320 to move inward, so that the tightening post 320 can move inward to tighten the ablation needle, thereby locking the ablation needle; when the outer end of the tightening post 320 contacts the cylindrical surface 312, the tightening post 320 at least partially stays in the movable hole 120, so that the cylindrical surface 312 is used to limit the outward movable range of the tightening post 320 to prevent it from completely separating from the movable hole 120. Figure 3 As shown, at this time, the outer end of the tightening column 320 is at the same height as the cylindrical surface 312, and the tightening column 320 is not tightened inward at this time. At this time, it is in an unlocked state. When the ablation needle needs to be locked, the spiral locking sleeve 310 can be rotated to make the spiral locking sleeve 310 move downward, and the conical surface 311 moves toward and gradually pushes the tightening column 320 to move inward until the ablation needle is locked, reaching a locked state.

[0041] Reference Figure 2 and Figure 3In a further embodiment of the present invention, a main pipe portion 220 with an outer circumferential diameter greater than the diameter of the first external threaded surface 110 is provided in the middle part of the sheath tube 200, and the front end face of the main pipe portion 220 is in contact with the rear end face of the outer sleeve 100 to limit the rearward movable stroke of the spiral locking sleeve 310, and when the rear end of the spiral locking sleeve 310 is against the front end of the main pipe portion 220, the outer end of the tightening column 320 corresponds to the cylindrical surface 312, that is, the tightening column 320 and the cylindrical surface 312 are in the same height range, and the outer end of the tightening column 320 can move outward to contact the cylindrical surface 312, thereby preventing the tightening column 320 from being separated from the limit of the cylindrical surface 312, so that the tightening column 320 is stably assembled.

[0042] Reference Figure 3 and Figure 4 In a further embodiment of the present invention, the ablation needle locking mechanism 300 further includes a locking pad 330. The outer end of the locking post 320 is hemispherical, facilitating the pushing of the conical surface 311 and reducing frictional resistance. The inner end surface of the locking post 320 is provided with a recess 321. The locking pad 330 is attached to the inner end surface of the locking post 320. The locking pad 330 is provided with a recess 331 that engages with the recess 321, thereby achieving the positioning and installation of the locking pad 330. The locking pad 330 contacts the ablation needle, increasing friction with the needle and enhancing the locking effect. This also prevents damage to the ablation needle due to rigid contact.

[0043] Reference Figure 3 and Figure 4 In a further embodiment of the present invention, a limiting ring 322 is provided on the peripheral wall of the tightening column 320. The limiting ring 322 is arranged outside the outer sleeve 100, and the outer peripheral contour of the limiting ring 322 is larger than the movable hole 120 to limit the depth of the tightening column 320 inserted into the outer sleeve 100, so as to prevent the tightening column 320 from moving too deep inward and disengaging from the movable hole 120 and falling into the outer sleeve 100.

[0044] In a further embodiment of the present invention, the locking pad 330 is made of silicone, which has a good friction coefficient. The silicone is also relatively soft, preventing damage to the ablation needle. The locking post 331 and the locking groove 321 form an interference fit, ensuring a stable installation of the locking pad 330. Furthermore, to prevent the locking pad 330 from contacting the inner wall of the movable hole 120 and being easily scraped by the inner wall during movement, which could cause the locking pad 330 to loosen, the outer diameter of the locking pad 330 is smaller than that of the movable hole 120.

[0045] like Figure 5 As shown, in other embodiments of the present invention, a limiting groove 332 is provided on the end surface of the locking pad 330 away from the pressing column 320, into which the ablation needle can be partially embedded, thereby limiting the ablation needle.

[0046] Reference Figure 2 and Figure 3In a further embodiment of the present invention, a convex shaft section 130 is provided at the rear end of the outer sleeve 100, the first external threaded surface 110 is provided on the outer peripheral wall of the convex shaft section 130, the inner peripheral wall of the convex shaft section 130 is provided with an internal threaded hole, and an external threaded shaft 230 is provided at the bottom of the sheath tube 200. The external threaded shaft 230 is threadedly connected to the internal threaded hole of the convex shaft section 130, thereby realizing a detachable connection of the sheath tube 200 by means of a threaded connection, and both installation and disassembly are very convenient.

[0047] Of course, in other embodiments, the ablation needle locking mechanism 300 can also be in the form of an elastic clamping column structure, which uses the elastic clamping column to elastically tighten the ablation needle embedded in the outer sleeve 100. Of course, the ablation needle locking mechanism 300 can also be in other structural forms, such as Figure 6 As shown, a threaded hole is provided on the peripheral wall of the outer sleeve 100, and a set screw 340 is threadedly installed in the threaded hole. The ablation needle can be fixed and loosened by screwing the set screw 340; a contact pad 341 can also be installed on the inner end surface of the set screw 340 to avoid rigid contact with the ablation needle.

[0048] Reference Figure 2 and Figure 3 In some embodiments of the present invention, a plurality of through-holes 140 are arranged around the outer peripheral wall of the front end of the outer sleeve 100, so that the through-holes 140 can be used as suction ports when negative pressure suction is performed.

[0049] Reference Figure 1 and Figure 2 A sealing plug 400 is connected to the peripheral wall of the sheath tube 200, and the sealing plug 400 is connected to the peripheral wall of the sheath tube 200 through a connecting line 410. The sealing plug 400 and the connecting line 410 can be made of silicone or rubber. The connecting line 410 can be connected to the peripheral wall of the sheath tube 200 by hot melting or gluing. The sealing plug 400 can be inserted into the rear end of the sheath tube 200 to seal the rear end of the sheath tube 200, so that the rear end of the sheath tube 200 can be blocked during negative pressure suction.

[0050] Of course, in other embodiments, the sealing plug 400 may not be provided, and a plurality of one-way sealing flaps may be provided in the inner hole of the sheath tube 200. The one-way sealing flaps are commonly used in medical devices and can allow a rotary cutter to pass through the flaps.

[0051] In existing technologies, only a very small fraction of inactivated tumor tissue undergoes absorption and cavitation in the body; the majority becomes fibrous proliferation foci, which takes a long time to evolve. This results in slow patient recovery, a heavy psychological burden, and difficulty determining residual tumor activity in the localized lesion. There is a potential risk of residual tumor from insufficient ablation, and even the need for a second surgery. Furthermore, the scope and extent of radical ablation rely on empirical judgment and lack pathological verification. Therefore, this device can also be used with a rotary cutting head to perform rotary excision of necrotic tissue at the ablation site, using negative pressure to aspirate the excised tissue. During rotary excision, small portions of the tumor tissue and adjacent tissue can be excised and sampled, facilitating pathological examination and comparison.

[0052] The following describes the ablation procedure:

[0053] A puncture needle is inserted into the outer sheath 100 to form a temporary assembly. Under the guidance of imaging equipment such as CT, the tumor edge is punctured. The puncture needle is removed, and a microwave ablation needle is inserted into the outer sheath 100, with the ablation needle exposed 2 cm from the front end of the outer sheath 100. Microwave ablation treatment is performed, and the ablation range covers 5-10 mm of the tumor edge. The ablation needle can be temporarily fixed using the ablation needle locking mechanism 300. When ablation is completed, the ablation needle locking mechanism 300 is operated to release the ablation needle. The upper sheath 200 is then installed. If hydropneumothorax occurs, negative pressure aspiration can be directly performed. Finally, a rotary extirpation knife can be inserted to excise necrotic tumor tissue. The excised tissue can then be collected and removed using negative pressure aspiration equipment and saline irrigation.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A microwave ablation assembly, characterized in that: include: An outer sleeve (100) is hollow and has ports at both the front and rear ends, and the outer sleeve (100) is used for inserting one of the puncture needle core, the ablation needle and the rotary cutter; A sheath tube (200) is detachably connected to the rear end of the outer tube (100) at its rear end. The sheath tube (200) is coaxially connected to the outer tube (100). A negative pressure suction side tube (210) is provided on the side wall of the sheath tube (200). The negative pressure suction side tube (210) is used to connect to a negative pressure suction device. The ablation needle locking mechanism (300) has a locking state for locking the position of the ablation needle inserted into the outer sleeve (100) and an unlocking state for releasing the ablation needle inserted into the outer sleeve (100). The ablation needle locking mechanism (300) is movably mounted on the outer sleeve (100) to achieve switching between the locking state and the unlocking state.

2. The microwave ablation assembly according to claim 1, characterized in that: The outer peripheral wall at the rear end of the outer sleeve (100) is provided with a first external threaded surface (110), and the peripheral wall of the outer sleeve (100) is provided with a movable hole (120). The ablation needle locking mechanism (300) includes a spiral locking sleeve (310) and a tightening column (320). The spiral locking sleeve (310) is threadedly connected to the first external threaded surface (110), and the tightening column (320) is movably inserted into the movable hole (120). The spiral locking sleeve (310) can be adjusted in position by rotating to raise or lower. When the spiral locking sleeve (310) moves downward, it can drive the tightening column (320) to move inward to tighten the ablation needle inserted into the outer sleeve (100) to lock the position of the ablation needle.

3. The microwave ablation assembly according to claim 2, characterized in that: The inner peripheral wall of the bottom of the spiral locking sleeve (310) is provided with a conical surface (311) and a cylindrical surface (312) in sequence from top to bottom. The conical surface (311) is flared downward, and the cylindrical surface (312) is connected to the bottom of the conical surface (311). The downward movement of the conical surface (311) can push the tightening column (320) to move inward; when the outer end of the tightening column (320) contacts the cylindrical surface (312), the tightening column (320) at least partially stays in the movable hole (120).

4. The microwave ablation assembly according to claim 3, characterized in that: A main pipe portion (220) having an outer diameter greater than the diameter of the first external threaded surface (110) is provided in the middle of the sheath tube (200). The front end face of the main pipe portion (220) is fitted with the rear end face of the outer sleeve (100) to limit the rearward movable stroke of the spiral locking sleeve (310). When the rear end of the spiral locking sleeve (310) abuts against the front end of the main pipe portion (220), the outer end of the tightening column (320) corresponds to the cylindrical surface (312).

5. The microwave ablation assembly according to any one of claims 2 to 4, characterized in that: The ablation needle locking mechanism (300) further includes a locking pad (330), the outer end of the tightening column (320) is a hemispherical surface, and the inner end surface is provided with an embedding groove (321), the locking pad (330) is attached to the inner end surface of the tightening column (320), and the locking pad (330) is provided with an embedding column (331) embedded in the embedding groove (321).

6. The microwave ablation assembly according to claim 5, characterized in that: A limiting ring (322) is provided on the peripheral wall of the tightening column (320), and the limiting ring (322) is arranged outside the outer sleeve (100). The outer peripheral contour of the limiting ring (322) is larger than the movable hole (120) to limit the depth of the tightening column (320) inserted into the outer sleeve (100).

7. The microwave ablation assembly according to claim 5, characterized in that: The locking pad (330) is made of silica gel, and the embedded column (331) and the embedded groove (321) are interference fit.

8. The microwave ablation assembly according to claim 2, characterized in that: The rear end of the outer sleeve (100) is provided with a convex shaft section (130), the first external threaded surface (110) is provided on the outer peripheral wall of the convex shaft section (130), the inner peripheral wall of the convex shaft section (130) is provided with an internal threaded hole, and the bottom of the sheath tube (200) is provided with an external threaded shaft (230), and the external threaded shaft (230) is threadedly connected to the internal threaded hole of the convex shaft section (130).

9. The microwave ablation assembly according to claim 1, characterized in that: A plurality of through holes (140) are arranged around the outer peripheral wall of the front end of the outer sleeve (100).

10. The microwave ablation assembly according to claim 1, characterized in that: A sealing plug (400) is connected to the peripheral wall of the sheath tube (200), and the sealing plug (400) can be inserted into the rear end of the sheath tube (200) to seal the rear end of the sheath tube (200).

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